Release of 12V Motor Control Renesas Solution Starter Kit for RL78/F24

PublishTime： 2022-07-08 Article Source：Renesas

Renesas will release an RL78/F24 BLDC-RSSK (12V Motor Control Renesas Solution Starter Kit for RL78/F24) in October 2022. This RSSK is appropriate for BLDC/FOC motor control and includes a small motor.

This RSSK includes a small motor and an inverter board, as well as three different motor control software versions:
#1 Sensorless FOC control based on 3-shunt

#2 Sensorless FOC control based on single-shunt

#3 Sensorless trapezoidal control

As soon as the user receives this kit, the motor operation can be evaluated targeting for e.g. future pumps and fan applications.

Figure 1 Renesas Solution Starter Kit (RTK7F124FGS0000BJ)

Figure 2 Block Diagram (Pump Example)

RL78/F24 BLDC-RSSK provides all reference design materials (circuit diagram, PCB pattern diagram, etc.) and characteristic data (EMC) so that the customer can easily design a motor control board for their specific application.

As an extension of the already existing RL78/F13, and F14 devices, at first, the new RL78/F24 MCU becomes available, which is providing an optimized feature set for small motor control. (Fig. 3)

Figure 3 RL78/F24 Motor Control Function

Extended complementary PWM mode of Timer RDe adds symmetric/asymmetric PWM function, and decimation function of interrupt and A/D trigger signal to existing Timer RD functions. The sensorless single-shunt FOC control method is realized by using the extended complementary PWM mode. For the current detection in U-, V-, and W-phase, it is necessary to acquire the single-shunt current in the state shown in Fig. 4.

Figure 4 Current Detection for Single-shunt Each Phase

The shunt current is measured by using the A/D converter, with its short conversion time. By using the asymmetric PWM output function of extended complementary PWM mode, A/D conversion can be performed without changing the PWM duty ratio. (Fig. 5)

Figure 5 Phase Shift for Single-shunt Current Detection

Single-shunt sensorless FOC motor control can be easily developed by using this kit. Furthermore, single-shunt FOC control systems can be realized at lower costs, because the components number is reduced compared to three-shunt FOC control.

Another new RL78/F24 feature is the application accelerator unit (AAU). The AAU performs various arithmetic operations on its own while off-loading the CPU. Hereby the overall required CPU processing for the vector control operation is strongly reduced.
Table.1 shows a list of specific AAU functions.

Table.1 Application Accelerator Unit Operation List

This kit utilizes “Clarke & Park transformation and PI control for motor operation” (No.7) and “Inverse Park & inverse Clarke transformation” (No.8).

The RL78/F24 MCU used in this RSSK provides various functions that are effective in motor control. It is an ideal product with a small size and very low power consumption that can meet various needs of customers' solutions.

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